good morning sir howto prepare iit self and i need some boooks please reply me sir

dear student 
i have already answered your question for chemistry , 
for physics , go with last 29 years paper by mtg publication and concept of physics by h c verma . 
for maths , go with IIT maths by M L  KHANNA > 
they will help you with self prep . 
and join a good test series . 
all the best 
kindly approve